Average Number Of Atoms Per Island

>100000

Figure 10.5. Effect of catalytic particle size on the dissociation rate of carton monoxide. Rhodium aggregates of various sizes, characterized by the number of Rh atoms per aggregate, were deposited on alumina (A^03) films. The rhodium was given a saturation carbon monoxide (CO) coverage, then the material was heated from 90 to 500 K (circles), or from 300 to 500 K (squares), and the amount of atomic carbon formed on the rhodium provided a measure of the dissociation rate for each aggregate (island) size.

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